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FFmpeg/libavfilter/vf_subtitles.c
Andreas Rheinhardt f58038d498 avcodec/avcodec: Avoid codec_desc.h, codec_par.h inclusions 
Instead, use forward declarations; and in order not to affect
any user include these headers for them, but not internally.
This has the advantage of removing implicit inclusions of these
headers from almost all files providing codecs.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2023-10-03 01:59:07 +02:00

517 lines
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/*
* Copyright (c) 2011 Baptiste Coudurier
* Copyright (c) 2011 Stefano Sabatini
* Copyright (c) 2012 Clément Bœsch
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* Libass subtitles burning filter.
*
* @see{http://www.matroska.org/technical/specs/subtitles/ssa.html}
*/
#include <ass/ass.h>
#include "config.h"
#include "config_components.h"
#if CONFIG_SUBTITLES_FILTER
# include "libavcodec/avcodec.h"
# include "libavcodec/codec_desc.h"
# include "libavformat/avformat.h"
#endif
#include "libavutil/avstring.h"
#include "libavutil/imgutils.h"
#include "libavutil/opt.h"
#include "libavutil/parseutils.h"
#include "drawutils.h"
#include "avfilter.h"
#include "internal.h"
#include "formats.h"
#include "video.h"
#define FF_ASS_FEATURE_WRAP_UNICODE (LIBASS_VERSION >= 0x01600010)
typedef struct AssContext {
const AVClass *class;
ASS_Library *library;
ASS_Renderer *renderer;
ASS_Track *track;
char *filename;
char *fontsdir;
char *charenc;
char *force_style;
int stream_index;
int alpha;
uint8_t rgba_map[4];
int pix_step[4]; ///< steps per pixel for each plane of the main output
int original_w, original_h;
int shaping;
FFDrawContext draw;
int wrap_unicode;
} AssContext;
#define OFFSET(x) offsetof(AssContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
#define COMMON_OPTIONS \
{"filename", "set the filename of file to read", OFFSET(filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS }, \
{"f", "set the filename of file to read", OFFSET(filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS }, \
{"original_size", "set the size of the original video (used to scale fonts)", OFFSET(original_w), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, FLAGS }, \
{"fontsdir", "set the directory containing the fonts to read", OFFSET(fontsdir), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS }, \
{"alpha", "enable processing of alpha channel", OFFSET(alpha), AV_OPT_TYPE_BOOL, {.i64 = 0 }, 0, 1, FLAGS }, \
/* libass supports a log level ranging from 0 to 7 */
static const int ass_libavfilter_log_level_map[] = {
[0] = AV_LOG_FATAL, /* MSGL_FATAL */
[1] = AV_LOG_ERROR, /* MSGL_ERR */
[2] = AV_LOG_WARNING, /* MSGL_WARN */
[3] = AV_LOG_WARNING, /* <undefined> */
[4] = AV_LOG_INFO, /* MSGL_INFO */
[5] = AV_LOG_INFO, /* <undefined> */
[6] = AV_LOG_VERBOSE, /* MSGL_V */
[7] = AV_LOG_DEBUG, /* MSGL_DBG2 */
};
static void ass_log(int ass_level, const char *fmt, va_list args, void *ctx)
{
const int ass_level_clip = av_clip(ass_level, 0,
FF_ARRAY_ELEMS(ass_libavfilter_log_level_map) - 1);
const int level = ass_libavfilter_log_level_map[ass_level_clip];
av_vlog(ctx, level, fmt, args);
av_log(ctx, level, "\n");
}
static av_cold int init(AVFilterContext *ctx)
{
AssContext *ass = ctx->priv;
if (!ass->filename) {
av_log(ctx, AV_LOG_ERROR, "No filename provided!\n");
return AVERROR(EINVAL);
}
ass->library = ass_library_init();
if (!ass->library) {
av_log(ctx, AV_LOG_ERROR, "Could not initialize libass.\n");
return AVERROR(EINVAL);
}
ass_set_message_cb(ass->library, ass_log, ctx);
ass_set_fonts_dir(ass->library, ass->fontsdir);
ass_set_extract_fonts(ass->library, 1);
ass->renderer = ass_renderer_init(ass->library);
if (!ass->renderer) {
av_log(ctx, AV_LOG_ERROR, "Could not initialize libass renderer.\n");
return AVERROR(EINVAL);
}
return 0;
}
static av_cold void uninit(AVFilterContext *ctx)
{
AssContext *ass = ctx->priv;
if (ass->track)
ass_free_track(ass->track);
if (ass->renderer)
ass_renderer_done(ass->renderer);
if (ass->library)
ass_library_done(ass->library);
}
static int query_formats(AVFilterContext *ctx)
{
return ff_set_common_formats(ctx, ff_draw_supported_pixel_formats(0));
}
static int config_input(AVFilterLink *inlink)
{
AssContext *ass = inlink->dst->priv;
ff_draw_init(&ass->draw, inlink->format, ass->alpha ? FF_DRAW_PROCESS_ALPHA : 0);
ass_set_frame_size (ass->renderer, inlink->w, inlink->h);
if (ass->original_w && ass->original_h) {
ass_set_pixel_aspect(ass->renderer, (double)inlink->w / inlink->h /
((double)ass->original_w / ass->original_h));
ass_set_storage_size(ass->renderer, ass->original_w, ass->original_h);
} else
ass_set_storage_size(ass->renderer, inlink->w, inlink->h);
if (ass->shaping != -1)
ass_set_shaper(ass->renderer, ass->shaping);
return 0;
}
/* libass stores an RGBA color in the format RRGGBBTT, where TT is the transparency level */
#define AR(c) ( (c)>>24)
#define AG(c) (((c)>>16)&0xFF)
#define AB(c) (((c)>>8) &0xFF)
#define AA(c) ((0xFF-(c)) &0xFF)
static void overlay_ass_image(AssContext *ass, AVFrame *picref,
const ASS_Image *image)
{
for (; image; image = image->next) {
uint8_t rgba_color[] = {AR(image->color), AG(image->color), AB(image->color), AA(image->color)};
FFDrawColor color;
ff_draw_color(&ass->draw, &color, rgba_color);
ff_blend_mask(&ass->draw, &color,
picref->data, picref->linesize,
picref->width, picref->height,
image->bitmap, image->stride, image->w, image->h,
3, 0, image->dst_x, image->dst_y);
}
}
static int filter_frame(AVFilterLink *inlink, AVFrame *picref)
{
AVFilterContext *ctx = inlink->dst;
AVFilterLink *outlink = ctx->outputs[0];
AssContext *ass = ctx->priv;
int detect_change = 0;
double time_ms = picref->pts * av_q2d(inlink->time_base) * 1000;
ASS_Image *image = ass_render_frame(ass->renderer, ass->track,
time_ms, &detect_change);
if (detect_change)
av_log(ctx, AV_LOG_DEBUG, "Change happened at time ms:%f\n", time_ms);
overlay_ass_image(ass, picref, image);
return ff_filter_frame(outlink, picref);
}
static const AVFilterPad ass_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.flags = AVFILTERPAD_FLAG_NEEDS_WRITABLE,
.filter_frame = filter_frame,
.config_props = config_input,
},
};
#if CONFIG_ASS_FILTER
static const AVOption ass_options[] = {
COMMON_OPTIONS
{"shaping", "set shaping engine", OFFSET(shaping), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 1, FLAGS, "shaping_mode"},
{"auto", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = -1}, INT_MIN, INT_MAX, FLAGS, "shaping_mode"},
{"simple", "simple shaping", 0, AV_OPT_TYPE_CONST, {.i64 = ASS_SHAPING_SIMPLE}, INT_MIN, INT_MAX, FLAGS, "shaping_mode"},
{"complex", "complex shaping", 0, AV_OPT_TYPE_CONST, {.i64 = ASS_SHAPING_COMPLEX}, INT_MIN, INT_MAX, FLAGS, "shaping_mode"},
{NULL},
};
AVFILTER_DEFINE_CLASS(ass);
static av_cold int init_ass(AVFilterContext *ctx)
{
AssContext *ass = ctx->priv;
int ret = init(ctx);
if (ret < 0)
return ret;
/* Initialize fonts */
ass_set_fonts(ass->renderer, NULL, NULL, 1, NULL, 1);
ass->track = ass_read_file(ass->library, ass->filename, NULL);
if (!ass->track) {
av_log(ctx, AV_LOG_ERROR,
"Could not create a libass track when reading file '%s'\n",
ass->filename);
return AVERROR(EINVAL);
}
return 0;
}
const AVFilter ff_vf_ass = {
.name = "ass",
.description = NULL_IF_CONFIG_SMALL("Render ASS subtitles onto input video using the libass library."),
.priv_size = sizeof(AssContext),
.init = init_ass,
.uninit = uninit,
FILTER_INPUTS(ass_inputs),
FILTER_OUTPUTS(ff_video_default_filterpad),
FILTER_QUERY_FUNC(query_formats),
.priv_class = &ass_class,
};
#endif
#if CONFIG_SUBTITLES_FILTER
static const AVOption subtitles_options[] = {
COMMON_OPTIONS
{"charenc", "set input character encoding", OFFSET(charenc), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS},
{"stream_index", "set stream index", OFFSET(stream_index), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, FLAGS},
{"si", "set stream index", OFFSET(stream_index), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, FLAGS},
{"force_style", "force subtitle style", OFFSET(force_style), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS},
#if FF_ASS_FEATURE_WRAP_UNICODE
{"wrap_unicode", "break lines according to the Unicode Line Breaking Algorithm", OFFSET(wrap_unicode), AV_OPT_TYPE_BOOL, { .i64 = -1 }, -1, 1, FLAGS },
#endif
{NULL},
};
static const char * const font_mimetypes[] = {
"font/ttf",
"font/otf",
"font/sfnt",
"font/woff",
"font/woff2",
"application/font-sfnt",
"application/font-woff",
"application/x-truetype-font",
"application/vnd.ms-opentype",
"application/x-font-ttf",
NULL
};
static int attachment_is_font(AVStream * st)
{
const AVDictionaryEntry *tag = NULL;
int n;
tag = av_dict_get(st->metadata, "mimetype", NULL, AV_DICT_MATCH_CASE);
if (tag) {
for (n = 0; font_mimetypes[n]; n++) {
if (av_strcasecmp(font_mimetypes[n], tag->value) == 0)
return 1;
}
}
return 0;
}
AVFILTER_DEFINE_CLASS(subtitles);
static av_cold int init_subtitles(AVFilterContext *ctx)
{
int j, ret, sid;
int k = 0;
AVDictionary *codec_opts = NULL;
AVFormatContext *fmt = NULL;
AVCodecContext *dec_ctx = NULL;
const AVCodec *dec;
const AVCodecDescriptor *dec_desc;
AVStream *st;
AVPacket pkt;
AssContext *ass = ctx->priv;
/* Init libass */
ret = init(ctx);
if (ret < 0)
return ret;
ass->track = ass_new_track(ass->library);
if (!ass->track) {
av_log(ctx, AV_LOG_ERROR, "Could not create a libass track\n");
return AVERROR(EINVAL);
}
/* Open subtitles file */
ret = avformat_open_input(&fmt, ass->filename, NULL, NULL);
if (ret < 0) {
av_log(ctx, AV_LOG_ERROR, "Unable to open %s\n", ass->filename);
goto end;
}
ret = avformat_find_stream_info(fmt, NULL);
if (ret < 0)
goto end;
/* Locate subtitles stream */
if (ass->stream_index < 0)
ret = av_find_best_stream(fmt, AVMEDIA_TYPE_SUBTITLE, -1, -1, NULL, 0);
else {
ret = -1;
if (ass->stream_index < fmt->nb_streams) {
for (j = 0; j < fmt->nb_streams; j++) {
if (fmt->streams[j]->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE) {
if (ass->stream_index == k) {
ret = j;
break;
}
k++;
}
}
}
}
if (ret < 0) {
av_log(ctx, AV_LOG_ERROR, "Unable to locate subtitle stream in %s\n",
ass->filename);
goto end;
}
sid = ret;
st = fmt->streams[sid];
/* Load attached fonts */
for (j = 0; j < fmt->nb_streams; j++) {
AVStream *st = fmt->streams[j];
if (st->codecpar->codec_type == AVMEDIA_TYPE_ATTACHMENT &&
attachment_is_font(st)) {
const AVDictionaryEntry *tag = NULL;
tag = av_dict_get(st->metadata, "filename", NULL,
AV_DICT_MATCH_CASE);
if (tag) {
av_log(ctx, AV_LOG_DEBUG, "Loading attached font: %s\n",
tag->value);
ass_add_font(ass->library, tag->value,
st->codecpar->extradata,
st->codecpar->extradata_size);
} else {
av_log(ctx, AV_LOG_WARNING,
"Font attachment has no filename, ignored.\n");
}
}
}
/* Initialize fonts */
ass_set_fonts(ass->renderer, NULL, NULL, 1, NULL, 1);
/* Open decoder */
dec = avcodec_find_decoder(st->codecpar->codec_id);
if (!dec) {
av_log(ctx, AV_LOG_ERROR, "Failed to find subtitle codec %s\n",
avcodec_get_name(st->codecpar->codec_id));
ret = AVERROR_DECODER_NOT_FOUND;
goto end;
}
dec_desc = avcodec_descriptor_get(st->codecpar->codec_id);
if (dec_desc && !(dec_desc->props & AV_CODEC_PROP_TEXT_SUB)) {
av_log(ctx, AV_LOG_ERROR,
"Only text based subtitles are currently supported\n");
ret = AVERROR_PATCHWELCOME;
goto end;
}
if (ass->charenc)
av_dict_set(&codec_opts, "sub_charenc", ass->charenc, 0);
dec_ctx = avcodec_alloc_context3(dec);
if (!dec_ctx) {
ret = AVERROR(ENOMEM);
goto end;
}
ret = avcodec_parameters_to_context(dec_ctx, st->codecpar);
if (ret < 0)
goto end;
/*
* This is required by the decoding process in order to rescale the
* timestamps: in the current API the decoded subtitles have their pts
* expressed in AV_TIME_BASE, and thus the lavc internals need to know the
* stream time base in order to achieve the rescaling.
*
* That API is old and needs to be reworked to match behaviour with A/V.
*/
dec_ctx->pkt_timebase = st->time_base;
ret = avcodec_open2(dec_ctx, NULL, &codec_opts);
if (ret < 0)
goto end;
#if FF_ASS_FEATURE_WRAP_UNICODE
/* Don't overwrite wrap automatically for native ASS */
if (ass->wrap_unicode == -1)
ass->wrap_unicode = st->codecpar->codec_id != AV_CODEC_ID_ASS;
if (ass->wrap_unicode) {
ret = ass_track_set_feature(ass->track, ASS_FEATURE_WRAP_UNICODE, 1);
if (ret < 0)
av_log(ctx, AV_LOG_WARNING,
"libass wasn't built with ASS_FEATURE_WRAP_UNICODE support\n");
}
#endif
if (ass->force_style) {
char **list = NULL;
char *temp = NULL;
char *ptr = av_strtok(ass->force_style, ",", &temp);
int i = 0;
while (ptr) {
av_dynarray_add(&list, &i, ptr);
if (!list) {
ret = AVERROR(ENOMEM);
goto end;
}
ptr = av_strtok(NULL, ",", &temp);
}
av_dynarray_add(&list, &i, NULL);
if (!list) {
ret = AVERROR(ENOMEM);
goto end;
}
ass_set_style_overrides(ass->library, list);
av_free(list);
}
/* Decode subtitles and push them into the renderer (libass) */
if (dec_ctx->subtitle_header)
ass_process_codec_private(ass->track,
dec_ctx->subtitle_header,
dec_ctx->subtitle_header_size);
while (av_read_frame(fmt, &pkt) >= 0) {
int i, got_subtitle;
AVSubtitle sub = {0};
if (pkt.stream_index == sid) {
ret = avcodec_decode_subtitle2(dec_ctx, &sub, &got_subtitle, &pkt);
if (ret < 0) {
av_log(ctx, AV_LOG_WARNING, "Error decoding: %s (ignored)\n",
av_err2str(ret));
} else if (got_subtitle) {
const int64_t start_time = av_rescale_q(sub.pts, AV_TIME_BASE_Q, av_make_q(1, 1000));
const int64_t duration = sub.end_display_time;
for (i = 0; i < sub.num_rects; i++) {
char *ass_line = sub.rects[i]->ass;
if (!ass_line)
break;
ass_process_chunk(ass->track, ass_line, strlen(ass_line),
start_time, duration);
}
}
}
av_packet_unref(&pkt);
avsubtitle_free(&sub);
}
end:
av_dict_free(&codec_opts);
avcodec_free_context(&dec_ctx);
avformat_close_input(&fmt);
return ret;
}
const AVFilter ff_vf_subtitles = {
.name = "subtitles",
.description = NULL_IF_CONFIG_SMALL("Render text subtitles onto input video using the libass library."),
.priv_size = sizeof(AssContext),
.init = init_subtitles,
.uninit = uninit,
FILTER_INPUTS(ass_inputs),
FILTER_OUTPUTS(ff_video_default_filterpad),
FILTER_QUERY_FUNC(query_formats),
.priv_class = &subtitles_class,
};
#endif
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